Orthopaedic Surgery - Posterior Tibial Tendon Rupture

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Basics

Posterior tibial tendon dysfunction (PTTD) is a common cause of adult acquired flatfoot deformity.

Modern terminology increasingly describes the broader deformity as:

Progressive collapsing foot deformity (PCFD)

because the disorder involves not only the posterior tibial tendon but also progressive failure of the:

Medial ligamentous structures

Spring ligament complex

Hindfoot alignment

and eventually, in advanced cases,

Ankle alignment.

Posterior tibial tendon rupture may represent the advanced end of this degenerative process or, less commonly, may occur acutely after trauma.

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Posterior Tibial Tendon Anatomy

The posterior tibialis muscle originates from the:

Posterior tibia

Posterior fibula

and

Interosseous membrane.

The tendon courses:

Posterior and inferior to the medial malleolus

before entering the medial foot.

It passes:

Posterior to the ankle axis

and

Medial to the subtalar joint axis.

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Insertion

The principal insertion is on the:

Navicular tuberosity.

Additional expansions attach to the:

Cuneiforms

and bases of the:

Second

Third

and

Fourth metatarsals.

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Function

The posterior tibial tendon contributes to:

Ankle plantarflexion

Subtalar inversion

Hindfoot stabilization

Support of the medial longitudinal arch

During gait, it helps invert the hindfoot and lock the:

Transverse tarsal joints

during push-off, creating a rigid lever for efficient propulsion.

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Consequences of Dysfunction

When posterior tibial tendon function deteriorates, the medial arch loses an important dynamic stabilizer.

This places increased stress on structures such as the:

Spring ligament

Talonavicular capsule

Medial midfoot ligaments

Over time, these structures may stretch and attenuate, producing:

Progressive arch collapse

Hindfoot valgus

Forefoot abduction

and later

Fixed deformity and arthritis.

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Gait Effect

Posterior tibial tendon insufficiency also reduces the ability of the foot to become a rigid lever during push-off.

This may make the:

Gastrocnemius-soleus complex

less mechanically efficient and contribute to:

Weak or altered gait.

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Acute Rupture

A true acute posterior tibial tendon rupture is uncommon.

When traumatic rupture occurs, patients may develop:

Sudden medial ankle or arch pain

followed by:

Weakness

and progressive flattening of the foot.

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Classification

The traditional Johnson-Strom classification, later modified by Myerson, describes progression from tendon disease to fixed deformity and ankle involvement.

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Stage I

Stage I consists primarily of:

Posterior tibial tendinitis, tenosynovitis, or early tendinosis

without structural flatfoot deformity.

The foot remains:

Normally aligned and flexible.

Typical findings include:

Pain and swelling along the tendon

with possible mild weakness.

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Stage II

Stage II is characterized by:

Flexible acquired flatfoot deformity.

Typical findings include:

Hindfoot valgus

Forefoot abduction

Loss of medial arch height

Posterior tibial weakness

The deformity remains:

Passively correctable.

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Stage II Forefoot Position

As the hindfoot collapses into valgus, the forefoot may appear:

Abducted relative to the hindfoot.

Once the hindfoot is manually corrected, a compensatory:

Forefoot varus or supination

may become apparent.

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Stage III

Stage III represents:

Rigid flatfoot deformity.

There is fixed:

Hindfoot valgus

and/or fixed:

Midfoot abduction and forefoot supination.

The subtalar deformity is:

No longer passively correctable.

Degenerative arthritis may be present in the:

Subtalar

Talonavicular

or

Calcaneocuboid joints.

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Stage IV

Stage IV represents advanced disease with:

Flatfoot deformity plus ankle involvement.

There may be:

Deltoid ligament insufficiency

Valgus tilt of the talus within the ankle mortise

and, in advanced cases,

Ankle arthritis.

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Synonyms

Traditional terms include:

Posterior tibial tendon dysfunction

Posterior tibial tendon insufficiency

Adult acquired flatfoot deformity

Modern terminology increasingly uses:

Progressive collapsing foot deformity.

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Epidemiology

Posterior tibial tendon dysfunction is one of the most common causes of:

Acquired flatfoot in adults.

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Age

It most often affects adults between approximately:

40 and 60 years of age.

Prevalence generally increases with:

Age.

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Sex

The disorder is more commonly reported in:

Middle-aged women.

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Risk Factors

Important risk factors include:

Obesity

Pre-existing pes planus

Diabetes mellitus

Inflammatory arthropathy

Seronegative spondyloarthropathy

Previous ankle trauma

Accessory navicular

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Corticosteroid Injection

Injection of corticosteroid directly around or into the posterior tibial tendon has historically been associated with:

Tendon weakening or rupture.

For this reason, intratendinous corticosteroid injection should generally be avoided.

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Genetics

There is no recognized Mendelian inheritance pattern.

Foot shape and ligamentous characteristics may have hereditary influences, but these do not explain most cases.

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Etiology

Most cases result from:

Chronic degenerative tendinopathy

rather than an acute inflammatory process.

Repeated mechanical overload may produce:

Microtearing

Collagen degeneration

Fibrosis

Tendon elongation

and eventually:

Partial or complete rupture.

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Hypovascular Zone

The segment of the tendon just posterior and distal to the:

Medial malleolus

has relatively limited vascularity.

This may contribute to:

Degeneration

and

Poor healing capacity.

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Mechanical Predisposition

Pre-existing:

Flatfoot

or an:

Accessory navicular

may alter the mechanical demands placed on the tendon and increase susceptibility to degeneration.

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Trauma

Less commonly, rupture may occur after:

Ankle fracture

Ankle sprain

Direct blow

or other traumatic injury.

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Associated Conditions

Progressive hindfoot valgus may lead to secondary shortening or contracture of the:

Gastrocnemius

Soleus

or

Achilles tendon.

This can further worsen deformity by increasing:

Forefoot and midfoot loading.

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Diagnosis

Diagnosis is based on:

History

Standing examination

Functional testing

and

Weight-bearing radiographs.

MRI is useful when the diagnosis or tendon integrity is uncertain.

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Signs and Symptoms

Typical findings include:

Progressive flattening of one foot

Medial ankle pain

Medial arch pain

Swelling around the medial malleolus

Weakness with walking

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Lateral Hindfoot Pain

As deformity progresses, pain may migrate from the medial side to the:

Lateral hindfoot.

This may result from:

Subfibular impingement

or lateral compression between the calcaneus and fibula.

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History

Many patients describe an:

Insidious onset.

Symptoms may begin with:

Medial ankle swelling and pain

followed gradually by:

Flattening of the arch

and increasing deformity.

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Traumatic History

A minority of patients recall a specific:

Ankle injury

or direct traumatic event.

Most cases, however, represent:

Chronic degenerative failure.

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Physical Examination

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Neurovascular Examination

Assess:

Distal pulses

Sensation

Motor function

before focusing on the tendon and deformity.

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Standing Examination

The foot should be examined while the patient is:

Weight bearing.

Assess:

Medial arch height

Hindfoot alignment

Forefoot abduction

Overall symmetry

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Gait

Observe for:

External rotation of the affected foot

Excessive pronation

Hindfoot valgus

Reduced push-off strength

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Posterior Tibial Tendon Strength

The tendon can be tested by asking the patient to:

Plantarflex and invert the foot against resistance

from a position of relative:

Plantarflexion and eversion.

Pain, weakness, or inability to invert suggests:

Posterior tibial tendon dysfunction.

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Tenderness

Tenderness may occur:

Along the tendon posterior to the medial malleolus

or at its insertion on the:

Navicular tuberosity.

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Swelling

Early disease may produce visible swelling along the:

Medial ankle

because of:

Tenosynovitis.

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Too-Many-Toes Sign

When viewed from behind, more toes are visible lateral to the heel on the affected side.

This is the:

Too-many-toes sign.

It reflects:

Forefoot abduction

and progressive collapse through the midfoot.

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Single-Leg Heel-Rise Test

A normal posterior tibial tendon should allow the patient to perform a:

Single-leg heel rise

while the heel moves from valgus into:

Varus.

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Abnormal Heel Rise

Patients with significant PTT dysfunction may demonstrate:

Inability to perform a single-leg heel rise

or

Failure of the heel to invert during heel rise.

Repeated heel rises may reveal weakness before a single attempt becomes impossible.

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Flexibility of Deformity

The examiner should determine whether:

Hindfoot valgus

and

Forefoot abduction

remain manually correctable.

This helps distinguish:

Flexible stage II disease

from

Rigid stage III disease.

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Gastrocnemius Tightness

Assess ankle dorsiflexion with the knee:

Extended

and

Flexed.

A positive:

Silfverskiöld test

may indicate isolated gastrocnemius contracture.

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Laboratory Tests

No laboratory test is required for uncomplicated PTT dysfunction.

Laboratory investigations may be appropriate if there is concern for:

Inflammatory arthritis

Neuropathy

or another systemic disease.

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Imaging

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Weight-Bearing Foot Radiographs

Weight-bearing radiographs are essential for evaluating:

Arch collapse

Forefoot abduction

Talonavicular uncoverage

Hindfoot or midfoot arthritis.

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AP Foot View

The AP view may demonstrate:

Lateral subluxation of the navicular

and

Uncovering of the talar head.

These findings reflect:

Forefoot abduction and talonavicular malalignment.

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Lateral Foot View

The lateral view may show:

Loss of medial longitudinal arch height

Reduced calcaneal pitch

Plantarflexion of the talus

and other signs of collapse.

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Weight-Bearing Ankle Radiographs

Ankle radiographs should be obtained when advanced disease is suspected.

They assess:

Ankle alignment

Degenerative change

and

Valgus talar tilt.

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Stage IV Imaging

A mortise view may demonstrate:

Valgus tilt of the talus

resulting from:

Deltoid ligament insufficiency.

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MRI

MRI is helpful when:

The diagnosis is uncertain

Tendon rupture is suspected

or

Surgical planning requires assessment of tendon quality.

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MRI Findings

The posterior tibial tendon may show:

Thickening

Hypertrophy

Longitudinal splitting

Increased signal

Attenuation

or

Complete rupture.

MRI may also identify associated injury to the:

Spring ligament

and other medial stabilizers.

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Ultrasound

Diagnostic ultrasound can also evaluate:

Tenosynovitis

Tendon degeneration

Partial tearing

Dynamic tendon continuity

although accuracy depends on operator experience.

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Pathological Findings

Early disease may demonstrate:

Tenosynovitis.

With progression, the tendon develops:

Tendinosis

Collagen degeneration

Fibrosis

Elongation

Partial tearing

Continued mechanical loading may ultimately produce:

Complete rupture.

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Differential Diagnosis

Important alternatives include:

Flexible congenital or benign flatfoot

Tarsal tunnel syndrome

Inflammatory hindfoot arthritis

Charcot neuroarthropathy

Accessory navicular syndrome

Deltoid ligament insufficiency

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Benign Flatfoot

A longstanding flexible flatfoot without:

Pain

Progressive deformity

Tendon weakness

is different from acquired PTT dysfunction.

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Tarsal Tunnel Syndrome

Tarsal tunnel syndrome typically produces:

Burning

Paresthesia

Numbness

rather than progressive arch collapse.

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Charcot Arthropathy

Charcot neuroarthropathy should be considered in patients with:

Peripheral neuropathy

Marked swelling

Warmth

Bony fragmentation

or rapidly progressive deformity.

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Treatment

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General Principles

Treatment depends on:

Stage

Flexibility of the deformity

Pain

Functional demands

Presence of arthritis

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Initial Nonoperative Treatment

Early symptomatic disease is initially treated with:

Activity modification

Immobilization

Orthotic support

Physical therapy

NSAIDs when appropriate

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Immobilization

A:

Walking boot

Cast

or

Ankle brace

may be used temporarily until acute pain and swelling improve.

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Assistive Devices

A:

Cane

or other walking aid may reduce loading during painful periods.

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Orthoses

Once acute pain subsides, patients may transition to:

Semirigid arch-supporting orthoses.

These aim to support the:

Medial longitudinal arch

and reduce strain on the posterior tibial tendon.

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Ankle-Foot Orthosis

More advanced flexible deformity may require an:

Ankle-foot orthosis (AFO)

to control:

Hindfoot valgus

and

Midfoot collapse.

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Physical Therapy

Physical therapy may include:

Posterior tibial and invertor strengthening

Calf stretching

Ankle and foot mobility exercises

Proprioceptive training

Gait retraining

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Gastrocnemius Stretching

Because calf tightness may worsen deformity, stretching of the:

Gastrocnemius-soleus complex

is often emphasized.

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Ultrasound Therapy

Therapeutic ultrasound has historically been used, but the core evidence-based components of rehabilitation are:

Strengthening

Stretching

Load modification

Mechanical support.

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Medication

NSAIDs may be used for:

Short-term pain relief

particularly when tenosynovitis is present.

They do not reverse:

Tendon degeneration or structural deformity.

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Surgery

Surgery is considered for:

Persistent pain

Progressive deformity

Functional limitation

or

Failure of appropriate nonoperative care.

The procedure is selected according to:

Stage and deformity pattern.

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Stage I Surgery

Persistent stage I disease may be treated with:

Tenosynovectomy

or debridement of diseased tendon.

Selected cases may require:

Tendon reconstruction or transfer

if significant tendon degeneration is present.

A calcaneal osteotomy is not routinely required when foot alignment remains normal.

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Flexor Digitorum Longus Transfer

The:

Flexor digitorum longus (FDL)

may be transferred to augment deficient posterior tibial tendon function.

It is commonly attached near the:

Navicular.

Because tendon transfer alone does not correct the underlying deformity, it is usually combined with:

Bony realignment procedures.

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Stage II Surgery

Flexible stage II deformity frequently requires a combination of procedures.

Common components include:

FDL tendon transfer

Medializing calcaneal osteotomy

and correction of additional deformity as needed.

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Medializing Calcaneal Osteotomy

A medial displacement calcaneal osteotomy shifts the heel:

Medially beneath the leg.

This reduces:

Hindfoot valgus

and decreases the mechanical load on the medial reconstruction.

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Lateral Column Lengthening

Marked forefoot abduction may require:

Lateral column lengthening

to improve coverage of the talar head and restore:

Midfoot alignment.

Modern reconstruction generally favors osteotomy rather than routine lateral column arthrodesis in flexible disease.

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Medial Column Correction

Residual forefoot supination may require:

Plantarflexion osteotomy of the medial cuneiform

often termed a:

Cotton osteotomy.

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First Tarsometatarsal Arthrodesis

When there is instability or arthritis at the:

First tarsometatarsal joint

fusion may be used to stabilize the medial column.

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Gastrocnemius Recession or Achilles Lengthening

An associated equinus contracture may require:

Gastrocnemius recession

or

Achilles tendon lengthening.

The choice depends on whether tightness is isolated to the gastrocnemius or involves the entire:

Gastrocnemius-soleus complex.

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Stage III Surgery

Rigid deformity with established hindfoot arthritis generally requires:

Arthrodesis.

Traditional treatment has included:

Triple arthrodesis

involving the:

Subtalar

Talonavicular

and

Calcaneocuboid joints.

Modern surgery may selectively fuse only the symptomatic arthritic joints when appropriate.

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Stage IV Surgery

Stage IV treatment depends on:

Ankle arthritis

Flexibility

Deltoid ligament competence

and

Overall deformity.

Options may include:

Deltoid reconstruction

Hindfoot reconstruction

Ankle fusion

Total ankle arthroplasty in selected patients

or

Pantalar fusion in severe end-stage disease.

Pantalar arthrodesis is therefore not required for every stage IV deformity.

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Referral

Patients with progressive deformity or suspected tendon rupture may be managed by an orthopaedic surgeon experienced in:

Foot and ankle reconstruction.

Complex stage II-IV disease is often referred to an:

Orthopaedic foot and ankle specialist.

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Follow-Up

Patients undergoing nonoperative treatment should be reassessed for:

Pain

Swelling

Arch collapse

Hindfoot alignment

Heel-rise ability

Progression of deformity.

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Prognosis

Early disease can often be controlled with:

Bracing

Orthoses

Activity modification

and

Rehabilitation.

This may be especially effective in:

Older or lower-demand patients.

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Progression

If the deformity remains unsupported and continues to progress, patients may develop:

Rigid hindfoot collapse

Subfibular impingement

Hindfoot arthritis

and eventually

Ankle valgus and arthritis.

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Surgical Prognosis

Appropriately selected reconstructive procedures generally provide:

Substantial pain relief

Improved alignment

Better walking function

and high patient satisfaction.

Outcome depends on:

Disease stage

Deformity severity

Presence of arthritis

Patient comorbidities.

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Complications

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Persistent Weakness

Even after treatment, some patients may have residual:

Inversion weakness

or reduced push-off strength.

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Recurrent Deformity

Progressive ligamentous failure or inadequate correction may result in:

Recurrent hindfoot valgus

Recurrent arch collapse

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Arthritis

Longstanding deformity may lead to progressive:

Subtalar

Talonavicular

Midfoot

and eventually

Ankle arthritis.

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Surgical Complications

Depending on the procedure, complications may include:

Nonunion

Malunion

Wound problems

Nerve injury

Hardware irritation

Overcorrection or undercorrection

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Patient Monitoring

Patients are typically reassessed every:

Several months during active treatment

until symptoms and function stabilize.

Monitoring should focus on:

Pain

Alignment

Foot flexibility

Single-leg heel-rise ability

Response to orthoses or bracing

Radiographic progression when indicated.

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Key Principle

Posterior tibial tendon dysfunction is a major cause of progressive acquired flatfoot in adults, but the deformity reflects failure of the entire medial stabilizing complex rather than the tendon alone.

The characteristic progression is from:

Medial tendon pain and tenosynovitis

to

Flexible hindfoot valgus and forefoot abduction

and ultimately to

Rigid deformity, arthritis, and possible ankle valgus.

Early disease is usually treated with:

Immobilization, orthoses, strengthening, and calf stretching, whereas progressive symptomatic deformity may require:

Stage-specific tendon reconstruction, osteotomy, or arthrodesis.